Water on Mars: The Debate Rages Anew
Space.com

Diverging from decades of conventional wisdom, a science team says liquid water can exist and pool on the surface of Mars, ideal for sustaining Martian life across the entire planet. If correct, the finding would build on images released in June that scientists have interpreted as showing liquid water at or near the surface of the Red Planet in recent geologic times. Many scientists were baffled by those images as it is widely assumed that liquid water cannot exist at Mars’ surface due to the planet’s thin atmosphere.